By Beverly Pfingsten, June 13, 2011
	1. Rainbow Arch Bridge Marker

For the Rainbow Arch Bridge, Marsh used a design that he had patented in 1912. Marsh's invention was an ingenious blend of steel and concrete technologies, which combined the concrete arch form with a sophisticated steel reinforcing system. The reinforcing was so heavy and complex, in fact, that his bridges have been called steel structures with concrete veneers. Marsh built several small-scale and medium-scale rainbow arches throughout the Midwest in the 1910s. This bridge at Fort Morgan represented the first large-scale application of his distinctive design.

The bridge at Fort Morgan has been listed on the National Register of Historic Places. It is the only rainbow arch built in Colorado, and at its completion it was the longest rainbow arch in the world. It is today a nationally significant example of the important, but relatively uncommon,

	By Beverly Pfingsten, June 13, 2011
	2. Rainbow Arch Bridge

structural type. As it arches gracefully over the broad Platte River, the Rainbow Arch Bridge symbolizes the permanence of early highway construction in the state.
 
Location. 40° 16.044′ N, 103° 48.076′ W. Marker is near Fort Morgan, Colorado, in Morgan County. Marker is on Colorado Route 52 0.1 miles north of Interstate 76, on the right when traveling north. Click for map. Marker is in this post office area: Fort Morgan CO 80701, United States of America.
 
Other nearby markers. At least 4 other markers are within walking distance of this marker. Fort Morgan (here, next to this marker); Sugar Beets (here, next to this marker); Watching River Wildlife (here, next to this marker); Old Fort Morgan (approx. half a mile away).
 
Related marker. Click here for another marker that is related to this marker. Marsh Rainbow Arch Bridge in Kansas.